JPH05337208A - Method and device for making medical treatment plan of localization radiation medical treatment device - Google Patents

Abstract

PURPOSE:To automatically calculate a rotation allowable range of a medical treatment gantry so that an irradiation condition can be determined easily by displaying a focus part view of a patient and a general view of the patient, etc., on a display screen so that the focus part becomes a real arrangement as the isocenter, and also, setting and checking a medical treatment condition from the display screen. CONSTITUTION:With regard to one piece each of plural pieces of photographed cross- sectional images, a body outline is inputted in a step 4, an interpolating work between one piece of obtained body outline and its next body outline is executed in a step 5, and an external view of the whole body of a patient is made in a step 6. Subsequently, in a step 7, an arrangement processing is executed, three-dimensional coordinate data of the patient and a medical treatment table at the time when a rotation angle of the medical treatment is varied by several degrees each is operated in a step 8, and a rotation allowable range of a medical treatment gantry atainst a rotation angle of the medical treatment table is operated in a step 9. Next, based on this rotation allowable value, an irradiation condition, etc., are set interactively in a step 10, and in a step 11, and in a step 11, a dose distribution plan is executed, and a dose distribution is projected to an image in a step 3 and confirmed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereotactic radiotherapy apparatus for stereotactically concentrating a narrow beam of radiation on a single point for treatment, and particularly to stereotactic radiotherapy suitable for determining treatment conditions in a treatment plan. The present invention relates to a method for creating a treatment plan for a treatment apparatus and a treatment planning apparatus.

[0002]

2. Description of the Related Art In a radiotherapy apparatus, a radiation irradiation method called a localization method has been attracting attention. The localization method is a treatment method that aims at destroying the lesion by focusing it on one point in a stereotactic manner with a thin beam of radiation and giving high dose only to the lesion area from multiple directions. The irradiation of radiation to the normal part around the part destroyed by the treatment is extremely reduced, which has the effect of eliminating the adverse effect on the normal part. In addition, it is possible to treat complications associated with surgery without worrying about it, and to treat lesions in areas where brain surgery is not possible (such as brain lesions) or residual lesions that could not be removed by surgery. The effect is also expected. Furthermore, there are great expectations for radiation therapy for lesions that move due to breathing.

A device for realizing the localization method is a stereotactic radiotherapy device. As a stereotactic radiation treatment apparatus, there are a multi-source radiation treatment apparatus called a gamma unit and a single-source radiation treatment apparatus using an electron accelerator or the like. The former consists of a cobalt 60 sealed source placed outside a hemispherical collimator with a large number of irradiation holes, and gamma doses from a large number of hemispherical cobalt 60 sources are concentrated on the lesion. The treatment can be realized.
On the other hand, the latter is capable of irradiating the lesion area from all directions while rotating the gantry around the lesion area of the patient and rotating the treatment table using an electron accelerator or the like.

Regardless of stereotactic radiation therapy, the most important thing in general radiation therapy is positioning and treatment planning. It is necessary to obtain the three-dimensional position information for locating a lesion, and a CT apparatus is mainly used for its identification. In the CT apparatus, the vicinity of the lesion of the patient is imaged with continuous slice planes. All CT projection image data is transferred to a computer assisted treatment planning system. In the treatment planning system, the position and spread of the lesion can be quantitatively measured and the lesion area can be determined by inputting the contour of the lesion from the projected multiple sectional images as shown in FIG. 6 (step 1). .. Further, the body contour around the lesion is extracted, and the position and contour of the internal organ are extracted (step 2) to identify the radiation sensitive organ. Further, a three-dimensional stereoscopic image is constructed from further continuous slice planes (step 3).

Here, as a treatment condition, an irradiation field (a shape for passing X-rays made by a collimator), irradiation conditions and the like (dose rate, irradiation frequency, irradiation date and time, etc.) are set (step 1
0), and the dose distribution calculation is executed three-dimensionally (Step 1
1) is done. The obtained dose distribution map is projected onto a CT image or a three-dimensional image for confirmation (step 12), if necessary, the irradiation field, irradiation conditions, etc. are determined (step 14), and these data are transferred to the treatment device ( Step 15) is performed.
If it is bad, further optimization is performed, and the settings such as conditions are changed and repeated. When the treatment method is determined, the patient is set in the treatment device, the lesion is positioned at the isocenter based on the treatment plan data, and the treatment is performed based on the irradiation condition.

[0006]

When stereotactic radiation therapy is performed using an electron accelerator, a therapeutic gantry rotates while irradiating radiation to an arbitrary position on a rotating treatment table. When there is a lesion on the abdomen, the rotation range of the therapeutic gantry is limited. For example, FIG. 7 shows a case where the treatment table 22 is horizontally rotated to a position where the body axis of the patient 20 is aligned with the radiation plane generated by the rotation of the treatment gantry 21, and when the lesion is the abdomen, the treatment table 22 is rotated. The top plate 22A of FIG. 2 will overhang considerably from the support table 23 of the treatment table, and the treatment gantry 21 can rotate only directly above the patient 20.

As described above, the rotation range of the treatment gantry changes depending on the position of the treatment table. Also, the rotation range varies depending on the size of the patient's body (fat person, medium person, thin person). Furthermore, the position of the top plate of the treatment table is different because the position of the irradiation target (lesion) is adjusted to the isocenter depending on the right side, left side, ventral side, and back side of the patient's body axis center. .. That is, there is a case where the top plate of the treatment table is laterally displaced from the central axis of the top plate.

As described above, the rotation range of the therapeutic gantry differs depending on the size of the patient's body and the position of the lesion. However, as described above, the conventional treatment planning device does not address such a problem, and the rotation condition of the treatment gantry is actually obtained by the treatment plan even when the treatment is started. Since the irradiation conditions do not match, it is necessary to redo the planned dose distribution. Therefore, the entire treatment plan is redone, and extra time is spent on both the patient and the operator, resulting in an inefficient treatment plan. Further, in order to avoid re-doing again as described above, the rotation range of the therapeutic gantry was measured in advance for each patient, but this was also inefficient.

An object of the present invention is to automatically calculate an allowable rotation range of a therapeutic gantry for any size of a patient's body and any position of a lesion, thereby facilitating irradiation conditions. An object of the present invention is to provide a treatment plan creation method and a treatment planning device for a stereotactic radiotherapy device that can be determined and are efficient.

[0010]

SUMMARY OF THE INVENTION The present invention provides a stereotactic radiotherapy apparatus that combines treatment gantry and rotary motion of a treatment table to stereotactically concentrate from one direction to another to irradiate and treat radiation. In the treatment plan creation method that determines dose plans, treatment conditions, etc., the treatment table diagram, the treatment gantry diagram, the patient's lesion map, and the patient's overall map are displayed in an actual arrangement with the lesion site as an isocenter. While displaying on the screen, the treatment condition is set and inspected from this display screen (Claim 1).

According to the present invention, a database unit for storing the external position coordinates of a treatment gantry and a treatment table with an arbitrary point as an origin, a body contour of a patient obtained by diagnosis, a lesion of the patient and tissues around the lesion. From the input means capable of inputting the situation and the constitutional image of the whole body of the patient composed of the body contour when the position of the lesion is aligned with the isocenter with respect to the origin, and the external position information of the treatment table on the database section, the lesion is identified. The treatment table is arbitrary from the first calculation means for calculating the three-dimensional position coordinates of the patient and the treatment table including the part and its surroundings, and the three-dimensional position coordinates of the patient and the treatment table obtained by the first calculation means. Second arithmetic means for arithmetically operating the three-dimensional position coordinates of the patient and the treatment table at the rotation angle position of, and an arbitrary rotation angle position of the treatment table based on the result obtained by the second calculation means. Against A third calculating means for calculating an allowable range for rotational movement of the therapeutic gantry, said second, third
The output means is provided for clearly indicating the positional relationship diagram of the patient, the treatment table, and the treatment gantry and the rotation allowable range obtained by the calculation means, and displaying the treatment condition setting and inspection.

Further, according to the present invention, with an arbitrary point as an origin,
A database unit that stores the outer position coordinates of the treatment gantry and the treatment table, an input unit that can input the intermittent body contour of the patient obtained by the diagnosis, and the tissue condition of the lesion site and the periphery of the patient, and the body contour. An interpolating means for interpolating in the body axis direction to obtain a constitutional image of the whole body of the patient, and a constitutional image of the whole body of the patient when the position of the lesion is aligned with the isocenter with respect to the origin, and a treatment table on the database unit. First computing means for computing the three-dimensional position coordinates of the patient and the treatment table including the lesion area and its periphery from the outer shape position information, and the three-dimensional patient and treatment table obtained by the first computing means Second calculating means for calculating the three-dimensional position coordinates of the patient and the treatment table at the arbitrary rotation angle position of the treatment table from the position coordinates;
Based on the result obtained by the second calculating means, a third calculating means for calculating an allowable range in which the therapeutic gantry can rotationally move with respect to an arbitrary rotational angle position of the treatment table; The output means for displaying the patient obtained by the calculation means 3, the arrangement table of the treatment table and the treatment gantry, and the rotation permissible range for clearly showing the treatment condition setting and inspection (claim 3).

Further, the present invention uses an arbitrary point as an origin,
The database unit that stores the external position coordinates of the treatment gantry and the treatment table, the input means that can input the intermittent body contour of the patient obtained by the diagnosis, and the tissue condition of the lesion and the periphery of the patient and the body contour Interpolation means for interpolating in the body axis direction to obtain a constitutional image of the whole body of the patient, the constitutional image of the whole body of the patient when the position of the lesion is aligned with the isocenter with respect to the origin, and the outer shape of the treatment table on the database section. First computing means for computing three-dimensional position coordinates of the patient and the treatment table including the lesion and its surroundings based on the position information, and 3 of the patient and the treatment table at an arbitrary rotation angle position of the treatment table. Second calculation means for calculating the dimensional position coordinates, and a permissible range in which the therapeutic gantry can be rotationally moved with respect to an arbitrary rotation angle position of the treatment table based on the result obtained by the second calculation means. Do The treatment condition is set based on the calculation means of 3 and the allowable rotational movement range, and the dose distribution in the set treatment condition is calculated from the three-dimensional position coordinates of the patient and the treatment table obtained by the second calculation means. Output means for projecting the obtained image, and displaying the image after the projection and the image of the treatment gantry for the inspection of the treatment conditions according to the actual arrangement and the rotation of the treatment table and the rotation of the treatment gantry. It was provided (Claim 4).

[0014]

According to the present invention, a table for treatment, a gantry diagram for treatment, a lesion view of a patient and an overall view of a patient are displayed on the display screen with the lesion as an actual center. Since the treatment conditions are set and inspected from this display screen, the treatment conditions can be created according to the body shape of the patient and the position and situation of the lesion (claim 1).

Further, according to the present invention, the three-dimensional position coordinates of the patient and the treatment table at the rotation angle position of the treatment table are calculated from the configuration image of the whole body of the patient composed of the body axis and the outer position information of the treatment table. Then, the allowable range of rotational movement of the therapeutic gantry for this result is calculated, and the positional relationship diagram of the patient, the treatment table, and the therapeutic gantry obtained in this way and the rotational allowable range are specified for the treatment condition setting and inspection. It is supposed to be displayed (claims 2 to 4). As a result, regardless of the size of the patient's body and the position of the lesion at any position on the body, the treatment can be performed at any rotation angle position of the treatment table at the stage of treatment planning. The allowable rotation range of the operating gantry can be automatically determined, and the operator can confirm it on the monitor that shows the positional relationship between the patient, the treatment table, and the rotating gantry during rotation, and the dose range can be checked using this allowable range data. The distribution calculation can be executed, and the optimal treatment conditions for stereotactic radiotherapy can be determined. Therefore, when the treatment is started as in the conventional case, the rotation condition of the treatment gantry does not match the irradiation condition obtained by the treatment plan, so that it is not necessary to redo the whole treatment plan, and the treatment is performed for each patient in advance. Since the rotation range of the gantry for use is not measured, extra time for treatment is not required, and an efficient treatment plan and treatment method can be obtained. In addition, since the treatment gantry does not come into contact with the patient during treatment, the patient can receive treatment with peace of mind. Further, the operator pays close attention to the treatment, but the attention can be reduced, and the radiation can be safely administered.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an embodiment of a processing flow of the treatment planning apparatus according to the present invention, FIG. 2 is an overall configuration diagram of a stereotactic radiotherapy apparatus according to the present invention, and FIG. 3 is an explanatory diagram for explaining a lesion and a slice surface around the lesion. 4, FIG. 4 is an explanatory diagram for explaining a sliced surface of the whole body of the patient, FIG. 5 is an explanatory diagram for explaining an interpolating means according to the present invention, FIG. 8 is a processing system diagram of the treatment planning apparatus of the present invention, and FIG. 9 is stereotactic radiotherapy. It is a display example figure which visualized and displayed a device.

The stereotactic radiotherapy apparatus shown in FIG.
6, the therapeutic gantry 21 which rotates around the patient 20 as indicated by the arrow 47, the irradiation head 45 supported by the therapeutic gantry 21, the collimator 47 supported by the irradiation head 45, and the patient 20. It is composed of a treatment table 22 on which the patient is laid down. The therapeutic gantry 21 rotates about a rotation axis 48, and the radiation is irradiated by the therapeutic gantry 21.
The beam passes through the irradiation head 45 provided in the laser beam and is collimated by the collimator 47 so that the beam is irradiated to the lesion 49. The intersection of the rotation axis 48 and the beam center 50 irradiated by the irradiation head 45 becomes an isocenter 51, and the lesion part 49 of the patient is aligned with this position. The treatment table 22 is fixed to a peripheral portion on a turntable 52 which is set with a vertical axis passing through the isocenter 51 as a rotation center.
It is possible to rotate in the direction of arrow 54 around the rotation center point 53.
As described above, the stereotactic radiotherapy apparatus is used for the therapeutic gantry 2
By combining the rotation of 1 and the rotation of the treatment table 22, radiation can be emitted from any direction.

The processing system shown in FIG. 8 includes a CPU 30, a main memory 31, an auxiliary memory 33, a dedicated hardware 34, an image memory 35, a CRT 36, an interface 37, an input device (keyboard) 38, interfaces 39 and 4.
0, a floc disk mechanism 41, and a common bus 43. The CPU 30 realizes the processing flow of FIG. 1 using the program of the main memory 31 and creates a treatment plan.
In addition to this, the CPU 30 rotates the treatment gantry 21 around the horizontal axis 48, rotates the treatment table 22 around the vertical axis based on the created treatment plan, and emits radiation according to the rotation. To treat the lesion. The control for this treatment is performed via the interfaces 39 and 40. However, the control for treatment may be performed by a CPU installed elsewhere.

Now, a configuration for realizing the processing flow of FIG. 1 will be described with reference to FIG. The main memory 31 stores a program for processing shown in FIG. However, in the processing, the dedicated hardware 34 performs processing that requires high-speed processing and special processing. The processing of the dedicated hardware 34 includes, for example, processing of obtaining projection data of dose distribution. The auxiliary memory 33 is a memory that stores the external position coordinates of the treatment gantry 21 and the treatment table 22 as a database. Here, the outer position coordinates are the target therapeutic gantry 21.
And the treatment gantry 21 and the treatment table 22, which are necessary to display the outer shapes of the treatment table 22 on the CRT 36, respectively. Therapeutic gantry 21
The outer shape position coordinates and the outer shape position coordinates of the treatment table 22 are separately stored so that they can be handled independently. The outer shape of the treatment gantry and the outer shape of the treatment table refer to the outer shape in a state where the treatment table and the gantry are combined as a treatment device. In this assembled treatment device, the contour position coordinates are obtained by plotting the contours of the treatment gantry and the treatment table. However, the treatment gantry and the treatment table each rotate during the treatment, and it is not a good idea to make a database of all the external position coordinates for each rotation because this increases the amount of data. Therefore, in this embodiment, the outer shape position coordinates obtained from the arrangement state of the gantry and the treatment table in the stationary state (initial state) before the treatment are stored as a database.

The auxiliary memory 33 stores, as data, the state (position, size) of the lesion and the surroundings of the lesion in addition to the above-mentioned external position coordinates. Furthermore, the auxiliary memory 33
Captures and stores the body contour image of the patient via the FDD 41. The body contour of the patient is the outer circumference of the slice surface at an arbitrary position in the body contour direction of the patient, and the position of this body contour is a position intermittently set in the body axis direction of the patient.
The body contour image is used to show the whole body of the patient. If the interval between body contour positions is small, just display this image,
You can see the whole body of the patient. If the body contour interval is wide, the whole body image is obtained by interpolating adjacent body contour images. This whole-body image of the patient is used as a patient image (outline image) when the treatment device is displayed on the screen and the patient is mounted on the treatment table of the displayed treatment device.

The CPU 30 establishes the above-mentioned treatment table, the treatment gantry, the whole body of the patient, and the lesion part in a positional relationship such as the actual arrangement before the treatment, and sends this to the image memory 35, and CR.
Display at T36. The display example is shown in FIG. In addition, rotate the treatment table on the screen and rotate the treatment gantry like an actual machine at each rotation position (operate the screen as if it is the actual arrangement during treatment) to allow the movement range of the treatment gantry. Is visually requested and displayed to that effect on the screen. The operator interactively uses the allowable range to set the irradiation field, irradiation conditions, etc., and make a dose distribution plan. The dose distribution plan is to determine a radiation irradiation trajectory and set a dose irradiation amount on the trajectory. Here, the orbit is a radiation irradiation orbit determined by the rotational position of the treatment table and the rotational orbit of the treatment gantry. FIG. 10 shows an example of a trajectory with respect to a lesion part of the head for facilitating the consideration. The first to ninth trajectories are shown for the lesion. This orbit is
It is the trajectory of the gantry at any bed position. There are similar trajectories for lesions such as the chest and abdomen. However, although the head is spherical and there is no restricted area in the allowable movement range of the gantry, the chest and abdomen are restricted by the bed and the body axis direction. Setting the irradiation field in consideration of this allowable range,
Irradiation conditions were set and a dose distribution plan was established.
The CPU 30 projects the dose distribution plan on the image of the actual arrangement being displayed (in particular, the lesion area of the patient and the image in the vicinity thereof) according to an instruction from the operator. Looking at this projection result diagram, the operator checks the dose distribution plan, and if necessary, resets the irradiation field and irradiation conditions. An example of this projection is shown in FIG. This figure is a dose projection diagram for a lesion and its surroundings under a dose distribution plan. As shown by the dotted lines A and B, the distribution of the skirt spread is a bad pattern in which normal tissues other than the lesion are irradiated. Therefore, in the case of projection examples such as A and B, the dose distribution plan is re-created so that the dose is concentrated on the lesion as shown by the solid line C. Thus, the screen is used to set the irradiation field, irradiation conditions, etc., and to make a dose distribution plan. Then, under this treatment condition, the treatment table is rotated on the screen, and the operation state of the actual machine in which the treatment gantry is rotated by an allowable range is displayed as shown in FIG.
Perform motion simulation. Motion simulation refers to a simulated motion in which the gantry is moved on the display screen or the bed is moved. If the operation can be confirmed, various set treatment conditions are stored in the main memory 31 for treatment.

The display of the actual arrangement in the above operation is shown in FIG.
Refer to the external display example of the actual machine as shown in. The patient placement for mounting the patient on the treatment table 22, the rotation of the treatment table to an arbitrary rotational position, and the position variation (screen variation) due to the rotation of the treatment gantry 21 are coordinate conversion, rotation, movement, and the like. This can be realized by using the image processing technology described above, and the CRT 36 can make the operator observe by displaying an image corresponding to the arrangement of the actual machines.

Next, the operation of setting and inspecting treatment conditions will be described with reference to the processing flow of FIG. In order to position the lesion, it is necessary to obtain three-dimensional position information of the lesion 40 and the periphery of the lesion, and as shown in FIG. Take a picture.
All image data obtained by this CT imaging is transferred to the auxiliary memory 33 of the treatment planning apparatus. The treatment planning apparatus performs lesion contour input (extraction) (step 1) for each of the plurality of transferred cross-sectional images, and determines a lesion area. Next, using the same cross-sectional image, the body contour around the lesion and the position contour of the internal organ are input (extracted) (step 2), the radiation sensitive organ is identified, and the above (step 1) (step 2) is performed. A stereoscopic image around the lesion is constructed using the result obtained in (step 3), and this data is used in the dose distribution plan (step 11). Up to this point, the procedure is the same as the conventional procedure.

Next, the permissible range in which the therapeutic gantry can be rotated with respect to an arbitrary rotational position of the treatment table is determined. The allowable rotation range of the treatment gantry is the rotation angle position of the treatment table, the size of the patient's body (fat person, medium person, thin person),
It depends on the location of the lesion. Therefore, first, it is necessary to input the body contour of the whole body of the patient (step 4). In the above (Step 1) and (Step 2), only the periphery of the lesion can be input. Therefore, it is necessary to capture a cross-sectional image of the whole body of the patient in advance with the CT apparatus or the MRI apparatus as in this case. FIG. 4 shows a slice plane 56 when an image is taken by the CT device. In FIG. 3, the periphery of the lesion is photographed at narrow intervals, but the whole body of FIG. 4 is photographed at wide intervals. Further, since the periphery of the lesion is photographed in FIG. 3, it is not photographed during this period in FIG. Body contour input (extraction) (step 4) is performed for each of the plurality of cross-sectional images photographed in this way, and then one body contour 60 obtained as shown in FIG. 5 and the next body contour 60 are obtained. Line 6 between contour 61
Interpolation work connected by 2 (step 5) is performed. These are all C
The contour of the whole body of the patient is created by performing the contour of the body obtained from the T image (step 6).

Next, the origin of one arbitrary three-dimensional coordinate is set, but in this embodiment, the isocenter is set as the origin. The isocenter represents the intersection 51 of the rotation axis 48 of the therapeutic gantry 21 and the radiation beam axis 50 in FIG. Next, a placement process is performed (step 7). Here, the placement processing is performed such that the position of the lesion is aligned with the isocenter 35 with the isocenter 35 as the origin, the outline drawing of the whole body of the patient created in (step 6) is placed, and the treatment table is placed under the image. Is to process. The external coordinates of the treatment table are
The database 17 (auxiliary memory 3
3) and use this data. In this way, by inputting the respective arrangement conditions of the treatment table, the patient, and the treatment gantry, the calculation means 1 (step 7) performs a calculation for converting each data into three-dimensional coordinate data with the isocenter 35 as the origin. The result is temporarily stored (step 19). Next, when the rotation angle of the treatment table changes, the rotation allowable range of the treatment gantry changes. Therefore, the three-dimensional coordinate data of the patient and the treatment table when the rotation angle of the treatment table is changed by several degrees in advance are obtained as the above result. (Step 1
9) is used to execute the calculating means 2 (step 8), and the result is temporarily stored (step 20). Using the above result (step 20) and the treatment gantry outline coordinate database 18, the calculation means 3 (step 9) for calculating the allowable range of rotational movement of the treatment gantry with respect to the rotation angle position of the treatment table is executed. Is temporarily stored (step 21). Here, the rotation allowable range of the therapeutic gantry is a safe rotational range in which the therapeutic gantry does not collide with the patient or the therapeutic table when the rotational angle position of the therapeutic table is changed, and this determines the therapeutic condition. Therefore, it becomes important especially in the treatment plan of stereotactic radiotherapy.

Based on the result of the rotation allowable value of the treatment gantry with respect to the rotation angle position of the treatment table (step 21), the operator interactively sets irradiation conditions and the like (step 1
0), do dose distribution plan (step 11). Confirm the projected dose distribution by projecting it on the image of (Step 3) above.
If it is good, the treatment conditions such as the irradiation field and the irradiation condition are determined (step 14), and if the treatment conditions are bad, the irradiation conditions and the like are set again. When the treatment condition is determined, a three-dimensional image simulating the actual arrangement as shown in FIG. 2 is output as shown in FIG. 9 (step 1
5) Then, the relation among the treatment table, the patient, and the treatment gantry is made to be equivalent to the movement during irradiation so that the simulation can be confirmed and the treatment condition parameters necessary for the treatment device are transferred to the treatment device ( Step 16). Incidentally, FIG.
Shows all of FIG. 2, but it may be simplified. Further, there is also a method in which the lesion is divided into abdominal lesions and the like, and a dose distribution plan for the whole and a dose distribution plan for each category are made, and a final dose distribution plan is made by combining both.

After this, the patient will be set on the treatment table of the treatment apparatus and will receive radiation treatment.

[0028]

According to the present invention, regardless of the size of the whole body of the patient and the position of the lesion on any part of the body, the treatment table can be used at the stage of treatment planning. It is possible to automatically determine the rotation allowable range of the treatment gantry with respect to any rotation angle position of, and the operator can confirm the positional relationship of the patient, the treatment table, and the treatment gantry during rotation, and the operator can confirm this. The dose distribution calculation can be performed using the tolerance data, and the optimal treatment conditions for stereotactic radiotherapy can be determined.

Therefore, when the treatment is started as in the conventional case, the rotation condition of the therapeutic gantry does not match the irradiation condition obtained by the treatment plan, so that it is not necessary to redo the whole treatment plan and the patient is preliminarily treated. Since the rotation range of the therapeutic gantry is not measured for each time, no extra time is required for the treatment, and an efficient treatment plan and treatment method can be obtained. Also, for the patient,
Since the treatment gantry does not come into contact with the patient during treatment, the treatment can be safely performed. Further, the operator pays close attention to the treatment, but the attention can be reduced and the radiation can be safely administered.

[Brief description of drawings]

FIG. 1 is an embodiment of a flowchart for creating a treatment plan according to the present invention.

FIG. 2 is a diagram showing an embodiment of the treatment apparatus of the present invention.

FIG. 3 is a diagram showing an example of a lesion part and peripheral slices thereof according to the present invention.

FIG. 4 is an explanatory diagram for intermittently inputting a body contour according to the present invention.

FIG. 5 is an explanatory diagram for obtaining a whole body ring image by interpolating a body contour according to the present invention.

FIG. 6 is a flowchart for creating a conventional treatment plan.

FIG. 7 is a diagram showing a conventional treatment apparatus.

FIG. 8 is an embodiment diagram of a processing system of the treatment planning apparatus of the present invention.

FIG. 9 is a diagram showing an image display example of the treatment apparatus of the present invention.

FIG. 10 is a diagram showing an example of an irradiation trajectory according to the present invention.

FIG. 11 is a projection example diagram of a dose distribution plan of the present invention.

[Explanation of symbols]

 4 Body contour input means for whole body of patient 5 Interpolation means 7 Calculation means 1 8 Calculation means 2 9 Calculation means 3 15 Output means 17 Treatment table outer shape coordinate database 18 Treatment gantry outer shape coordinate database

Claims (4)

[Claims] 1. A dose plan, treatment condition determination, etc. of a stereotactic radiotherapy apparatus that performs treatment by combining treatment gantry and rotary motion of a treatment table and concentrating on one point stereotactically from multiple directions. In the treatment planning method to be performed,
The treatment table diagram, the gantry diagram for treatment, the lesion site diagram of the patient, and the overall view of the patient are displayed on the display screen so that the lesion site is the actual center, and the treatment conditions can be set and set from this display screen. A method for preparing a treatment plan for a stereotactic radiotherapy apparatus adapted to be inspected. 2. A radiation treatment apparatus for performing treatment by radiating radiation by concentrating treatment from a gantry for treatment and rotary movement of a treatment table at a single point stereotactically from multiple directions to perform dose planning, determination of treatment conditions, and the like. In the treatment planning device, a database unit that stores the external position coordinates of the treatment gantry and the treatment table with an arbitrary point as the origin, the body contour of the patient obtained by the diagnosis, and the tissue condition of the patient's lesion and its periphery are displayed. From the input means that can be input and the origin, from the constituent image of the whole body of the patient consisting of the body contour when the position of the lesion is adjusted to the isocenter and the external position information of the treatment table on the database unit, From the first calculation means for calculating the three-dimensional position coordinates of the patient and the treatment table including the surroundings and the three-dimensional position coordinates of the patient and the treatment table obtained by the first calculation means, the treatment table is arbitrarily selected. Second calculating means for calculating the three-dimensional position coordinates of the patient and the treatment table at the rotation angle position, and an arbitrary rotation angle position of the treatment table based on the result obtained by the second calculation means. On the other hand, a third computing means for computing a permissible range of rotational movement of the therapeutic gantry, a positional relationship diagram of the patient, the treatment table and the therapeutic gantry obtained by the second and third computing means, and rotational allowance. A treatment planning apparatus comprising output means for clearly indicating a range and displaying the treatment condition setting and inspection. 3. A radiation treatment apparatus, which combines treatment gantry and rotary movement of a treatment table and concentrates at one point stereotactically from multiple directions to irradiate and perform treatment, for dose planning, determination of treatment conditions, etc. In the treatment planning device, a database unit that stores the external position coordinates of the treatment gantry and the treatment table with an arbitrary point as the origin, the intermittent body contour of the patient obtained by the diagnosis, and the lesion site of the patient and its surroundings. Input means capable of inputting the tissue condition, interpolation means for interpolating the body contour in the body axis direction to obtain a constitutional image of the whole body of the patient, and the whole body of the patient when the position of the lesion is aligned with the isocenter with respect to the origin. And a first calculating means for calculating three-dimensional position coordinates of the patient and the treatment table including the lesion area and its surroundings from the configuration image of the treatment table on the database section and the outer shape information of the treatment table on the database section. Calculation Second calculation means for calculating the three-dimensional position coordinates of the patient and the treatment table at the arbitrary rotation angle position of the treatment table from the three-dimensional position coordinates of the patient and the treatment table obtained by the means, and the second calculation Based on the result obtained by the means, the third calculation means for calculating the allowable range of rotational movement of the treatment gantry with respect to an arbitrary rotation angle position of the treatment table, and the second and third calculation means. A treatment planning apparatus comprising: output means for clearly showing a layout diagram of a patient, a treatment table, and a treatment gantry and a rotation permissible range for displaying treatment condition setting and inspection. 4. A radiation treatment apparatus which combines treatment gantry and rotary movement of a treatment table and concentrates at one point stereotactically from multiple directions to irradiate and perform radiation treatment for dose planning, treatment condition determination, and the like. In the treatment planning device, a database unit that stores the external position coordinates of the treatment gantry and the treatment table with an arbitrary point as the origin, the intermittent body contour of the patient obtained by the diagnosis, and the lesion site of the patient and its surroundings. Input means capable of inputting the tissue condition and interpolation means for interpolating the body contour in the body axis direction to obtain a constitutional image of the whole body of the patient, and the origin of the whole body of the patient when the focus position is aligned with the isocenter with respect to the origin. The treatment table is arbitrary, and a first calculation means for calculating three-dimensional position coordinates of the patient and the treatment table including the lesion and its periphery from the configuration image and the outer shape position information of the treatment table on the database section. At the rotation angle position of the patient and the treatment table, the second calculation means for calculating the three-dimensional position coordinates of the patient and the treatment table, and based on the result obtained by the second calculation means, with respect to an arbitrary rotation angle position of the treatment table. And a third calculating means for calculating an allowable range of rotational movement of the therapeutic gantry,
A treatment condition is set based on this rotational movement allowable range, and the dose distribution in the set treatment condition is projected on an image obtained from the three-dimensional position coordinates of the patient and the treatment table obtained by the second calculation means. And output means for displaying the image after projection and the image of the treatment gantry according to the actual arrangement and rotation of the treatment table and rotation of the treatment gantry for inspection of treatment conditions. Treatment planning device.